Users can check the "X-PerlMX-Spam" entry in the Internet headers (with a SPAM-tagged
message open, select View, Options) to see the probability which has been assigned to
a specific message. Messages with a SPAM probability of less than 50% will not be subject line
tagged and messages with a probability of less than 20% will not have an "X-PerlMX-Spam"
header entry.